With over 40 years experience of designing and building high integrity test and calibration systems, Chell's team of mechanical, electronic and software engineers are ready to design and build solutions for your R&D and production test and calibration applications.
Chell provides customers with a comprehensive calibration service covering all measurement instruments supplied by the company.
Chell Instruments offer a wide range of high quality and reliable mass flow meters, controllers and systems suitable for use in a wide range of applications and industries.
With over 40 years of experience in flow measurement and control, we are extremely well placed to assist in specifying and supplying instumentation for your application, from single instruments to bespoke automated systems. Chell's impressive calibration and repair facilities also allow us to offer comprehensive after sales support.
Chell Instruments are the UK distributor for the 'SAES Pure Gas' range of gas purification equipment. These offer incredible purification performance over a huge range of gases and flow rates through the use of absorber, adsorber, catalyst, heated getter and palladium membrane purification technologies.
We also supply a range of gas handling solutions, from full, bespoke gas panels to high performance needle valves and regulators.
Chell offer a wide range of equipment for the measurement and control of gas pressure. This could be a very high-end primary pressure standard, benchtop calibrator, portable calibrator or simply a single transducer. We can also provide bespoke, automated pressure measurement systems tailored to your exact process requirements.
Chell's impressive calibration and repair facilities also allow us to offer comprehensive after sales support.
Chell supply a range of temperature scanners to complement the pressure scanners
Chell Instruments offer a wide range of high quality and reliable vacuum measurement instrumentation for use in a huge variety of applications and industries.
With over 30 years of experience in vacuum measurement and control, we are extremely well placed to assist in specifying and supplying instrumentation for your application, from single instruments to bespoke automated systems.
Chell's impressive calibration and repair facilities also allow us to offer comprehensive after sales support.
The P3200 Models are available in single or dual piston formats for increased operating ranges. Units can be supplied in psi, bar, kgf/cm², and MPa. These robust instruments are highly accurate, quick and easy to use. Units feature a built-in priming pump for large volume applications, piston flotation indicators and a high quality screw press for fine pressure control.
Optional PressCal software is available for pressure calculations and certificate generation.
Operating principle
Deadweight testers are the high performance pressure standard for pressure measurement. Utilizing the well proven piston-gauge system consisting of a vertically mounted, precision lapped piston and cylinder assembly, accurately calibrated weight masses (Force) are loaded on the piston (Area), which rises freely within its cylinder. These weights balance the upward force created by the pressure within the system. The pressure is measured when placed on a correctly spinning and floating piston. The total pressure measured is the summation of the weights plus the piston weight carrier assembly.
Pressure Ranges |
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Distilled water operated | Ranges to 10,000 psi (700 bar) |
Accuracy |
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Accuracy | ±0.015% of reading (±0.008% optional)
*Accuracy based on % of reading from 10% to 100% of the piston range when used in accordance with the corrections found on the calibration certificate. Below 10% ± (accuracy class) x 10% of the piston range. |
Materials of Construction |
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Standard weight material | Series 3 non-magnetic austenitic stainless steel |
Weight density | 7.8 g/cm³ |
Optional fractional weights | Solution heat treated aluminum |
Weight density | 2.7 g/cm³ |
Piston material | Tungsten carbide with nickel binder Density- 15.0 g/cm³ |
Cylinder material | Hardened martensitic steel Tungsten carbide (water above 500 psi, 35 bar) |
Thermal coefficients of expansion | Oil piston/cylinder 16.5 ppm/°C Water (above 500 psi, 35 bar) 11 ppm/°C |
General |
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Test port adaptors | 1/8, 1/4, 3/8 and 1/2 NPT or BSP |
Instrument weight | 36 lbs (16 kg) |
Instrument size | (W x D x H) 17.5 in x 12 in x 8.5 in (440 mm x 300 mm x 215 mm) |
Mass set weight (typical) | 80 lbs (36 kg) |
Reservoir volume | 150 cc |
Screw press displacement | 5.5 cc |
Pump displacement | 4.7 cc per stroke |
O-ring seal materials | Buna N as standard, Viton and EPDM available |
Weight Increments |
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Minimum Standard Weight Increments | Up to 500 psi (35 bar): 1 psi (0.1 bar) 500 to 5000 psi (35 to 350 bar): 10 psi (1 bar) 5000 to 20,000 psi (350 to 1400 bar): 20 psi (2 bar) Model P3112: 1 psi (0.1 bar) |
Optional Fractional Weights | Up to 500 psi (35 bar): 0.1 psi (0.01 bar) 500 to 5000 psi (35 to 350 bar): 1 psi (0.1 bar) 5000 to 20,000 psi (350 to 1400 bar): 2 psi (0.2 bar) |
Operating Fluids |
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Operating Fluids | Distilled or deionized water |
Options |
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PressCal Software | Windows-based software program that allows users to easily apply all necessary corrections to enhance the deadweight tester performance. Calibration details are then stored and/or used to automatically create a calibration certificate. PressCal is provided as standard with all 0.008% instruments |
Fluids | Instruments can be supplied for use with Skydrol or brake fluids. Due to the aggressive nature of these fluids the standard nitrile seals and the acrylic reservoir tube will be replaced by either Viton or EPDM seals (as applicable) and an aluminum reservoir tube. For these or any other specialty fluid applications, please consult the factory. |